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Q.

How many of the following produce $N_{2}$ on being heated?
$(i) {(N H_{4})}_{2} C r_{2} O_{7} (i i) N H_{4} N O_{2} (i i i) N H_{4} C l O_{4}$
$(i v) {(N H_{4})}_{2} S O_{4} (v) N a N_{3} (v i) B a {(N_{3})}_{2}$
$(v i i) P b {(N O_{3})}_{2} (v i i i) A g N O_{3} (i x) L i N O_{3}$

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answer is 5.

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Detailed Solution

$(i, i i, i i i, v, v i)$

${({NH}_{4} )}_{2} {Cr}_{2} O_{7} \to N_{2} + {Cr}_{2} O_{3} + H_{2} O {NH}_{4} {NO}_{2} ⟶ N_{2} + 2 H_{2} O 2 {NH}_{4} {ClO}_{4} \to N_{2} + {Cl}_{2} + O_{2} + H_{2} O 2 {NaN}_{3} \to 2 Na + 3 N_{2} Ba {(N_{3})}_{2} \overset{heat}{\to} Ba + 3 N_{2}$

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How many of the following produce N2 on being heated?(i)(NH4)2Cr2O7(ii)NH4NO2(iii)NH4ClO4(iv)(NH4)2SO4(v)NaN3(vi)Ba(N3)2(vii)Pb(NO3)2(viii)AgNO3(ix)LiNO3